Can connect to 5.7ghz access points but not 2.4ghz access points

https://bbs.archlinux.org –
I am running Arch Linux on a Thinkpad T420 laptop. When trying to connect to a university network, I am encountering an issue where I am able to connect to certain access points but not to others. I believe the pattern is that I can connect to 5.7ghz access points but not to 2.4ghz access points. When connecting to a 2.4ghz access point, I get a "direct probe to <BSSID> timed out" error. I am using wicd with wpa_supplicant and PEAP/GTC authentication. This is especially troublesome because I cannot choose which access point to connect to - it is a WPA2 Enterprise network,
(HowTos)

Stories similar to Can connect to 5.7ghz access points but not 2.4ghz access points

I have the nexus 5. I brought it and paid full price. My bill is $80 a month for unlimited everything. I was going through my phone and noticed that I have several access points that I can connect to for a celluar data connection. I have include a screen shot of the access points I can connect to. When I first got the phones. It was connected to the MetroPCS. But I don't have that so I change it.

To extend the area of my wireless LAN I thought on buying a couple of wireless access points and giving them the same SSID + Security (WPA2) + Channel and all connecting them by LAN with the same network.

Now my question is: Could there be inteference in areas where more than one access point share the same area? Is there a special technique made for that?